Bonding-pin and method of making same.



N0. 69l,3|3. Patented lan. [4, I902.

C. A. HOLDRIDGE.

BONDING PIN AND METHOD OF MAKING SAME.

(Application filed Nov. 18, 1901.)

(No Model.)

UNITED STATES PAT T CFFICE.

CLARENCE A. IIOLDRIDGE, OF CHICAGO HEIGHTS, ILLINOIS, ASSIGNOR TO DAVID S. IVEGG, OF CHICAGO, ILLINOIS.

BONDING-PIN AND METHOD OF MAKING SAME.

SPECIFICATION formingpart of Letters Patent No. 691,313, dated January 14, 1902.

Annlication filed November 18, 1901. Serial No. 82,778. (No model.)

To all whom it may concern.- I as embodied in a convenient and practical Be it known that I, CLARENCE A. HoLD- form, and in which RIDGE, a citizen of the United States, residing Figure 1 is a longitudinal section through at Chicago Heights, county of Cook, State of a bonded rail-joint, showing the application Illinois, have invented acertain new and usethereto of my improved bonding-pin; Fig. 2,

ful Improvement in Bonding-Pins and Methan edge View of a blank from which my bondods of Making the Same; and I declare the ing-pin is formed; Fig. 3, a plan view of the following to be a full, clear, and exact deblank illustrated in Fig. 2; Fig. 4, a perspecscription of the invention, such as will enable tive view of the completed'bonding-pin, and

[0 others skilledin the art to which it pertains to Fig. 5 a transverse sectional view on line 5 5 6o make and use the same, reference being had of Fig. 4. to the accompanying drawings, which form a The same reference characters are usedto part of this specification. indicate the same parts in the several figures My invention relates in general to improveof the drawings.

I5 mentsin electric connectors for unitinga wire Reference-letters A and A indicate the ador other small electric conductor to a larger joining ends of two rails, while reference-letconductor, and more particularly to a bondters B and B indicate the usual joint-plates ing pin for securing a wire within holes secured to the opposite sides of the rail-joint formed in the adjoining rails of a railroadby any suitable meanssuch, for instance,

20 track. as bolts and nuts on the ends thereof. Open- In bonding rails it is necessary'that the terings a and a are provided in the adjoining minals of the bond should be closely and serails, such openings being preferably formed curely connected tothe rails throughout athrough the webs of the rails. sufficient portion of their surfaces to insure C indicates a bond, which may consist of a 25 the electrical contact requisite for the pas- \wire conductor the opposite ends of which sage of the current. are securedwithin the openings a and a of An object of my invention is to provide a the adjoining rails to electrically unite the bonding-pin capable of being readily placed same. In order that the wire conductor may upon an end of the bond and of being then be closely and securely connected to the rails,

0 driven into an opening through the rail, it is'necessary that a bonding-plug or chanthereby securely fastening the bond to the nel-pin should be .interposed between the rail and forming an electrical connection beends of the wireconductor and the walls surtween the bond and rail of the necessary carounding the holes through the rails. pacity. D indicates my improved bonding pin,

3 5 A further object of my invention is to prowhich consists in a plurality (preferably two) vide a bonding-pin which will be inexpensive of longitudinal grooved portions united so in manufacture, simple in application, and as to form a hollow pin. The grooved porefiicient in use. 4 tions are preferably tapered and are united My invention consists, essentially, in a at their smaller ends by straps d d, prefer- 0 bonding-pin composed of grooved portions ably formed integral with the grooved por- 9o united at their ends by integral straps. tions of the pin. While the bonding-pin My invention further consists in a bondingmay be constructed in any suitable manner, pin comprising two grooved semicircular tait has been found in practice that it may be pered portions connected at their smaller advantageously constructed as follows: A

45 ends by integral straps. blank is rolled into the shape illustrated in 5 My invention still further consists in a Figs 2 and 3,-such blank being tapered both method for making a bonding-pin. on its flat surfaces and edges from its outer My invention will be more fully described ends toward the center thereof, as clearly inhereinafter with reference to the accompanydicated in the figures referred to. An open- 50 ing drawings, in which the same is illustrated ing d is then punched through the reduced 10o central portion of the blank, thereby forming straps d d on either side of such opening. The blank then consists in two tapered portions united at their smaller ends by integral straps d d. The blank is then stamped so as to assume a semicircular shape with alongitudinal central groove. The blank is then bent upon the connecting-straps (1' cl, so that the two end portions are brought together, forming a hollow pin, such as illustrated in Fig. 4c.

The bonding-pin may be conveniently applied in the following manner: The end of the smaller conductor, which is usually a wire,'is passed through the openinga in the rail and the bonding-pin then placed around the end of the wire, as shown at the left of Fig. 1, with the reduced or smaller end thereof adjacent. totheopening through the rail. The smaller end of the pin when around the wire being slightly smaller than the diameter of theopening through the rail the pin may be readily driven into the opening by applying power to the larger end thereof. The taper of the pin, while permitting the latter to. be easilydriven into the hole through the rail, does not prevent an extended and close contact between the pin and the wall surrounding the hole, as clearly indicated at theright of Fig. 1. r

From the foregoing description it is evi dent thatyI have devised a simple and efficient. bondingpin comprising two portions bent together, thereby forming a hollow pin of, a diameter substantially the same as that of the smaller conductor or bond. lt is also evident that I have devised a simple and convenient method of constructing such bonding-pin, such method,,generally stated, consisting in forming the pinin two alined portions, connected by integral straps and then bending the portions together to form a hol low pin.

While I have described more orless. precisely the details of construction, I do not wish tobe understood as limiting myself thereto, as. I contemplate changes in form, the proportion of parts, and the substitution of equivalents, as circumstances may suggest or render expedient, without departing from the spirit of my invention.

Having now fully described my invention, whatl claim as new, and desire to secure by Letters Patent, is

1. A bonding-pin composed of a plurality of grooved tapered portions united by straps, substantially as described.

2. A bonding-pin composed of a plurality of tapered grooved portions connected at their smaller ends by integral straps, substantially as described.

3. A bonding-pin composed of semicircular grooved tapered portions united at either side of their smaller ends byintegral straps, substantially as described.

4. In a bonding-pin, the combination with two grooved tapered portions, of integral straps the ends of each of which are united to the smaller ends of the tapered portions of the pin, substantially as'described.

5. The method of making a bonding-pin which consists in forming the same in two grooved alined portions, and then bending the portions together to form a hollow pin, substantially as described.

6. The method of constructing a bonding pin which consists in rolling a blank, punching an opening through the central portion, forming a central longitudinal groove therein, and bending the portions of the blank together to form a hollow pin, substantially as described.

7. The method of making a bonding-pin which consists in rolling a tapered blank larger at each end than at the center, punch- .ing an opening through the reduced central portion, stamping the blank into semicircular portions having longitudinal grooves therein, and bending the semicircular portions together to form a hollow pin, substantially as described.

In testimony whereof I sign this specification in the presenceof two witnesses.

CLARENCE A. HOLDRIDGE.

Witnesses:

GEo. L, WILKINsoN, CLARA O. CUNNINGHAM. 

